NAME

       SDL_atan - Compute the arc tangent of x .

HEADER FILE

       Defined in SDL3/SDL_stdinc.h

SYNOPSIS

       #include "SDL3/SDL.h"

       double SDL_atan(double x);

DESCRIPTION

       The definition of y=atan(x) is x=tan(y) .

       Domain:  -INF<=x<=INF  Range:  -Pi/2<=y<=Pi/2  This  function operates on double-precision floating point
       values, use

       SDL_atanf
        for single-precision floats.

       To calculate the arc tangent of y / x, use SDL_atan2 .

       This function may use a different approximation across different versions, platforms and  configurations.
       i.e,  it can return a different value given the same input on different machines or operating systems, or
       if SDL is updated.

FUNCTION PARAMETERS

       x      floating point value.

RETURN VALUE

       Returns arc tangent of of x in radians, or 0 if x=0 .

THREAD SAFETY

       It is safe to call this function from any thread.

AVAILABILITY

       This function is available since SDL 3.2.0.

SEE ALSO

       •(3), SDL_atanf(3), •(3), SDL_atan2(3), •(3), SDL_tan(3)

Simple Directmedia Layer                            SDL 3.2.8                                        SDL_atan(3)